The 24-year-old Aussie striker bagged 31 goals in an incredible first campaign in the Hoops which ended with him picking up a championship winner's medal.
McDonald admits many will expect him to flop in his second season at Celtic Park as more than a few players have done before him.
But he is determined to show he is no flash in the pan.
He told the Daily Record: "As I come to the start of my second season at Celtic, I know I have more of a point to prove and to show everyone that it wasn't just a one-off season I had.
"You've got to go out there and do it again and if I can do that it could be the making of me. Hopefully that is the case and there are many more good times to come.
"All I can do is work hard, like I did this season, and hopefully the rewards will come my way again "It's a mindset as well. Everyone thinks it's going to be harder the next season but you need to get that out, start afresh, work hard and be as hungry as you were then.
"I'm certainly hungry for more success on a personal note and for my team. There was hunger to go out there and do well because when I went to the club no one expected me to be a regular starter or to score as many goals as I did.
"So from the start I had a point to prove."
However, this self-confident character always felt he was good enough and is now intent on getting even better.
McDonald said: "It's hard to believe how well it went but I've now got to look forward to next season.
"It's probably going to be doubly hard but it's something I am going to look forward to.
"Hopefully we can go out there and win another championship and a few more trophies next season."